Cenozoic Era, the most recent great division of geological time, including the present. It follows the Mesozoic (middle-life) Era. The Cenozoic Era is divided by most geologists into the Tertiary and Quaternary periods. Geologists estimate that the Cenozoic Era began some 65,000,000 years ago.Cenozoic Era animals date from 65 million years ago to the present.
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